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00W025A
Sound Processor IC
BH3878KS2
Description BH3878KS2 is a sound controller IC for mini component stereo. 5-channel input selector, vocal fader, volume, surround, 5-band graphic equalizer, dynamic bass, and 5-band spectrum analyzer are all integrated into this single chip. Switching noise is reduced when volume, vocal fader, surround and dynamic bass are changed by soft switch. Features 1) All in one chip IC incorporating functions of volume, tone, and spectrum analyzer. 2) Soft switching that can reduce the stepping switching noise when volume, mode selector, surround, dynamic bass and the gain of graphic equalizer are switched. 3) 5-channel input selector, mode selector, volume, surround graphic equalizer, dynamic bass, and spectrum analyzer can be controlled by serial control from micro controller. 4) Built-in matrix surround, B.P.F for spectrum analyzer. 5) Low distortion, low noise by BiCMOS process using resistance ladder type volume. 6) Mode of dynamic bass and bi-amplifier can be switched. Applications Mini component stereo, micro component stereo, CD radio cassette player, TV Absolute Maximum Ratings (Ta=25C)
Parameter Power supply voltage Power dissipation Operating temperature range Storage temperature range Derating : 12.0mW/C for operation above Ta=25C Symbol Vcc Pd Topr Tstg Limits 10.0 1200 Unit V mW
Dimension (Units : mm)
14.00.3 12.00.2 48 33 14.00.3 12.00.2 49 32 0.5 0.1250.1 0. 15
64 1 0.65 16
17
1.40.1 0.1
0.30.1
SQFP-T64
-20 -55
~ +70 ~ +125
C C
Recommended Operating Conditions (Ta=25C)
Parameter Power supply voltage Symbol Vcc Min. 8.5 Typ. 9 Max. 9.5 Unit V
May, 2001
Electrical characteristics (Unless otherwise noted; Ta=25C, Vcc=9V, f=1kHz, Rg=600, RL=10k,
Parameter Circuit current at no signal Maximum output voltage Voltage gain Total harmonic distortion rate Output noise voltage Residual noise voltage Cross talk Volume maximum attenuation Vocal fader suppressed quantity Graphic equalizer gain Surround maximum voltage gain Dynamic bass boost gain Microphone voltage gain Symbol IQ VOM GV THD VNO VMNO CT ATTMAX GVF VGQB VSUMAX VBB GMIC Min. -- 2.0 0.8 -- -- -- 70 86 25 Typ. 40 2.5 2.8 0.01 35 5 80 95 30 Max. 60 -- 4.8 0.05 50 20 -- -- -- Unit mA Vrms dB % Vrms Vrms dB dB dB dB dB dB dB V
Vin=800mVrms, INPUT SELECTOR=Ach, MODE SELECTOR=through, VOLUME=0dB, SURROUND=0dB, GRAPHIC EQUALIZER=0dB, DYNAMIC BASS=0dB, SPECTRUM ANALYZER=RESET) Conditions At no signal THD=1% Vo=1Vrms, 400Hz-30kHz BPF Rg=0, Biamp=0dB, DIN AUDIO Rg=0, Volume=- Biamp=0dB, DIN AUDIO Rg=0, Biamp=0dB, DIN AUDIO DIN AUDIO Vin=200mVrms fin=100Hz, 300Hz,1kHz,3kHz, or 10kHz Vin=300mVrms, fin=1kHz Vin=100mVrms, fin=75Hz, 23pin=GND Vin=400mVrms Vin=-12dBV
9
5 15 0.6 4.0
12
7 18 2.6 4.8
15
9 21 4.6 --
Spectrum analyzer max. output level VMAX
Block Diagram
DPLL1 DPLL2 DPLR1 DPLR2 RECL VFC1 VFC2 F1L1 F1L2 F2L1 F2L2 F3L1 F3L2 F4L1 F4L2 F5L PS1 MIC BASS1 BASS2 25 26 Vcc 1 2 Vcc 30 VCC 28 FILTER 54 GND 32 OUTL 27 BASS3 VCA FILTER 29 CAP
29 30 30
53 55 56 -5dB INLE 49 -6dB INLD 47 INLC 45 INLB 43 INLA 41 MODE SELECTOR 2.8dB
51
57 58 59 60
59
60
63 64 3 4 7 8 11 12 15
0~30dB
-30dB ~ -
HPFL1 HPFL2 HPFL3 17 18 19 HPF
30
10K 2.6dB
L-R EFFECT PS
5BAND EQ
10K 2.8dB
5BAND EQ
INRA 42 INRB 44 INRC 46 INRD 48 -6dB INRE 50 -5dB RECR 52
31 OUTR
31
105Hz 340Hz 1KHz 3.4Hz
3.4KHz 10.5KHz
HPF DET DET DET DET DET ALC MPX 33 STEPC
33
10.5KHz
DET DET DET DET DET
DIGITAL CONTROL
35 SCK 34 SI
40
22K
BH3878KS2 36 37 38 39 1 2 5 6 9 10 13 14 16
16 14 13 10
35 34
20 21 22
22
24 23
22
BPOUT F1R1 F1R2 F2R1 F2R2 F3R1 F3R2 F4R1 F4R2 F5R
BPNF
A B C
HPFR1 HPFR2 HPFR3
ALCR ALCC
40
20

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